Analysis by: Joselyn Canuela
ALIASES:

Backdoor:Linux/Setag.A (Microsoft), Linux.Chikdos.B!gen2 (Symantec), Backdoor.Linux.Ganiw.H (BitDefender)

 PLATFORM:

Linux

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 1,135,000 bytes
File Type: ELF
Initial Samples Received Date: 24 Jul 2016

Arrival Details

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Backdoor drops the following files:

  • /{malware path}/Dest.cfg
  • /{malware path}/appq.log
  • /{malware path}/conf.n
  • /user/bin/bsd-port/knerl.conf
  • /user/bin/bsd-port/udevd.conf
  • /usr/lib/libamplify.so - list of IP addresses used for its DDoS capabilities
  • /tmp/notify.file
  • /proc/net/pktgen/kpktgend_{number}
  • /proc/net/pktgen/eth_{number}
  • /proc/net/pktgen/pgctrl

It drops the following copies of itself into the affected system:

  • /usr/bin/lsof
  • /usr/bin/.sshd
  • /user/bin/bsd-port/knerl
  • /user/bin/bsd-port/udevd

It creates the following folders:

  • /usr/bin/dpkgd

Other Details

This Backdoor connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.189.10
  • {BLOCKED}.{BLOCKED}.189.18
  • {BLOCKED}.{BLOCKED}.100.100
  • {BLOCKED}.{BLOCKED}.0.55
  • {BLOCKED}.{BLOCKED}.211.22
  • {BLOCKED}.{BLOCKED}.114.114
  • {BLOCKED}.{BLOCKED}.115.115
  • {BLOCKED}.{BLOCKED}.111.118
  • {BLOCKED}.{BLOCKED}.249.50
  • {BLOCKED}.{BLOCKED}.249.54
  • {BLOCKED}.{BLOCKED}.255.228
  • {BLOCKED}.{BLOCKED}.6.6
  • {BLOCKED}.{BLOCKED}.33.240
  • {BLOCKED}.{BLOCKED}.97.234
  • {BLOCKED}.{BLOCKED}.97.238
  • {BLOCKED}.{BLOCKED}.97.242
  • {BLOCKED}.{BLOCKED}.160.110
  • {BLOCKED}.{BLOCKED}.10.20
  • {BLOCKED}.{BLOCKED}.150.20
  • {BLOCKED}.{BLOCKED}.252.16
  • {BLOCKED}.{BLOCKED}.55.244
  • {BLOCKED}.{BLOCKED}.1.1
  • {BLOCKED}.{BLOCKED}.192.1
  • {BLOCKED}.{BLOCKED}.192.174
  • {BLOCKED}.{BLOCKED}.255.18
  • {BLOCKED}.{BLOCKED}.192.68
  • {BLOCKED}.{BLOCKED}.199.8
  • {BLOCKED}.{BLOCKED}.96.68
  • {BLOCKED}.{BLOCKED}.107.85
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.226.68
  • {BLOCKED}.{BLOCKED}.6.2
  • {BLOCKED}.{BLOCKED}.98.55
  • {BLOCKED}.{BLOCKED}.128.68
  • {BLOCKED}.{BLOCKED}.134.68
  • {BLOCKED}.{BLOCKED}.152.3
  • {BLOCKED}.{BLOCKED}.154.3
  • {BLOCKED}.{BLOCKED}.192.68
  • {BLOCKED}.{BLOCKED}.199.68
  • {BLOCKED}.{BLOCKED}.200.101
  • {BLOCKED}.{BLOCKED}.213.68
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.227.68
  • {BLOCKED}.{BLOCKED}.24.34
  • {BLOCKED}.{BLOCKED}.3.141
  • {BLOCKED}.{BLOCKED}.3.144
  • {BLOCKED}.{BLOCKED}.7.90
  • {BLOCKED}.{BLOCKED}.8.141
  • {BLOCKED}.{BLOCKED}.9.141
  • {BLOCKED}.{BLOCKED}.0.117
  • {BLOCKED}.{BLOCKED}.0.68
  • {BLOCKED}.{BLOCKED}.176.22
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.225.68
  • {BLOCKED}.{BLOCKED}.24.68
  • {BLOCKED}.{BLOCKED}.243.112
  • {BLOCKED}.{BLOCKED}.44.150
  • {BLOCKED}.{BLOCKED}.96.112
  • {BLOCKED}.{BLOCKED}.0.20
  • {BLOCKED}.{BLOCKED}.195.68
  • {BLOCKED}.{BLOCKED}.196.115
  • {BLOCKED}.{BLOCKED}.196.212
  • {BLOCKED}.{BLOCKED}.196.228
  • {BLOCKED}.{BLOCKED}.196.230
  • {BLOCKED}.{BLOCKED}.196.232
  • {BLOCKED}.{BLOCKED}.196.237
  • {BLOCKED}.{BLOCKED}.46.151
  • {BLOCKED}.{BLOCKED}.112.10
  • {BLOCKED}.{BLOCKED}.144.30
  • {BLOCKED}.{BLOCKED}.16.10
  • {BLOCKED}.{BLOCKED}.16.11
  • {BLOCKED}.{BLOCKED}.0.242
  • {BLOCKED}.{BLOCKED}.240.6
  • {BLOCKED}.{BLOCKED}.32.36
  • {BLOCKED}.{BLOCKED}.32.39
  • {BLOCKED}.{BLOCKED}.96.10
  • {BLOCKED}.{BLOCKED}.96.5
  • {BLOCKED}.{BLOCKED}.1.29
  • {BLOCKED}.{BLOCKED}.1.53
  • {BLOCKED}.{BLOCKED}.67.14
  • {BLOCKED}.{BLOCKED}.67.4
  • {BLOCKED}.{BLOCKED}.3.3
  • {BLOCKED}.{BLOCKED}.3.8
  • {BLOCKED}.{BLOCKED}.64.33
  • {BLOCKED}.{BLOCKED}.64.1
  • {BLOCKED}.{BLOCKED}.128.33
  • {BLOCKED}.{BLOCKED}.144.33
  • {BLOCKED}.{BLOCKED}.160.33
  • {BLOCKED}.{BLOCKED}.192.33
  • {BLOCKED}.{BLOCKED}.208.33
  • {BLOCKED}.{BLOCKED}.224.33
  • {BLOCKED}.{BLOCKED}.64.1
  • {BLOCKED}.{BLOCKED}.84.58
  • {BLOCKED}.{BLOCKED}.84.67
  • {BLOCKED}.{BLOCKED}.252.8
  • {BLOCKED}.{BLOCKED}.128.32
  • {BLOCKED}.{BLOCKED}.103.36
  • {BLOCKED}.{BLOCKED}.104.15
  • {BLOCKED}.{BLOCKED}.104.26
  • {BLOCKED}.{BLOCKED}.107.27
  • {BLOCKED}.{BLOCKED}.128.166
  • {BLOCKED}.{BLOCKED}.128.68
  • {BLOCKED}.{BLOCKED}.128.86
  • {BLOCKED}.{BLOCKED}.134.133
  • {BLOCKED}.{BLOCKED}.134.33
  • {BLOCKED}.{BLOCKED}.144.47
  • {BLOCKED}.{BLOCKED}.154.15
  • {BLOCKED}.{BLOCKED}.209.133
  • {BLOCKED}.{BLOCKED}.209.5
  • {BLOCKED}.{BLOCKED}.64.68
  • {BLOCKED}.{BLOCKED}.69.38
  • {BLOCKED}.{BLOCKED}.75.68
  • {BLOCKED}.{BLOCKED}.86.18
  • {BLOCKED}.{BLOCKED}.96.68
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.7.17
  • {BLOCKED}.{BLOCKED}.7.6
  • {BLOCKED}.{BLOCKED}.0.68
  • {BLOCKED}.{BLOCKED}.192.67
  • {BLOCKED}.{BLOCKED}.198.167
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.5.68
  • {BLOCKED}.{BLOCKED}.96.68
  • {BLOCKED}.{BLOCKED}.104.68
  • {BLOCKED}.{BLOCKED}.160.68
  • {BLOCKED}.{BLOCKED}.166.4
  • {BLOCKED}.{BLOCKED}.168.8
  • {BLOCKED}.{BLOCKED}.192.66
  • {BLOCKED}.{BLOCKED}.192.68
  • {BLOCKED}.{BLOCKED}.224.67
  • {BLOCKED}.{BLOCKED}.224.8
  • {BLOCKED}.{BLOCKED}.96.68
  • {BLOCKED}.{BLOCKED}.100.18
  • {BLOCKED}.{BLOCKED}.100.21
  • {BLOCKED}.{BLOCKED}.94.20
  • {BLOCKED}.{BLOCKED}.94.241
  • {BLOCKED}.{BLOCKED}.96.9
  • {BLOCKED}.{BLOCKED}.211.193
  • {BLOCKED}.{BLOCKED}.211.225
  • {BLOCKED}.{BLOCKED}.196.6
  • {BLOCKED}.{BLOCKED}.3.140
  • {BLOCKED}.{BLOCKED}.4.130
  • {BLOCKED}.{BLOCKED}.192.33
  • {BLOCKED}.{BLOCKED}.241.1
  • {BLOCKED}.{BLOCKED}.13.101
  • {BLOCKED}.{BLOCKED}.112.50
  • {BLOCKED}.{BLOCKED}.150.66
  • {BLOCKED}.{BLOCKED}.17.107
  • {BLOCKED}.{BLOCKED}.28.231
  • {BLOCKED}.{BLOCKED}.28.234
  • {BLOCKED}.{BLOCKED}.28.237
  • {BLOCKED}.{BLOCKED}.160.185
  • {BLOCKED}.{BLOCKED}.160.5
  • {BLOCKED}.{BLOCKED}.241.34
  • {BLOCKED}.{BLOCKED}.32.178
  • {BLOCKED}.{BLOCKED}.106.19
  • {BLOCKED}.{BLOCKED}.145.194
  • {BLOCKED}.{BLOCKED}.151.161
  • {BLOCKED}.{BLOCKED}.156.66
  • {BLOCKED}.{BLOCKED}.164.6
  • {BLOCKED}.{BLOCKED}.180.2
  • {BLOCKED}.{BLOCKED}.200.69
  • {BLOCKED}.{BLOCKED}.240.100
  • {BLOCKED}.{BLOCKED}.242.18
  • {BLOCKED}.{BLOCKED}.245.180
  • {BLOCKED}.{BLOCKED}.75.123
  • {BLOCKED}.{BLOCKED}.91.1
  • {BLOCKED}.{BLOCKED}.1.3
  • {BLOCKED}.{BLOCKED}.2.18
  • {BLOCKED}.{BLOCKED}.29.150
  • {BLOCKED}.{BLOCKED}.29.170
  • {BLOCKED}.{BLOCKED}.29.68
  • {BLOCKED}.{BLOCKED}.73.34
  • {BLOCKED}.{BLOCKED}.197.58
  • {BLOCKED}.{BLOCKED}.16.99
  • {BLOCKED}.{BLOCKED}.90.68
  • {BLOCKED}.{BLOCKED}.210.100
  • {BLOCKED}.{BLOCKED}.210.98
  • {BLOCKED}.{BLOCKED}.6.3
  • {BLOCKED}.{BLOCKED}.158.11
  • {BLOCKED}.{BLOCKED}.159.3
  • {BLOCKED}.{BLOCKED}.61.225
  • {BLOCKED}.{BLOCKED}.61.235
  • {BLOCKED}.{BLOCKED}.61.255
  • {BLOCKED}.{BLOCKED}.62.1
  • {BLOCKED}.{BLOCKED}.62.60
  • {BLOCKED}.{BLOCKED}.130.1
  • {BLOCKED}.{BLOCKED}.72.65
  • {BLOCKED}.{BLOCKED}.80.65
  • {BLOCKED}.{BLOCKED}.88.129
  • {BLOCKED}.{BLOCKED}.136.81
  • {BLOCKED}.{BLOCKED}.144.161
  • {BLOCKED}.{BLOCKED}.0.81
  • {BLOCKED}.{BLOCKED}.24.129
  • {BLOCKED}.{BLOCKED}.64.129
  • {BLOCKED}.{BLOCKED}.1.97
  • {BLOCKED}.{BLOCKED}.193.97
  • {BLOCKED}.{BLOCKED}.72.1
  • {BLOCKED}.{BLOCKED}.64.129
  • {BLOCKED}.{BLOCKED}.96.65
  • {BLOCKED}.{BLOCKED}.121.27
  • {BLOCKED}.{BLOCKED}.2.4
  • {BLOCKED}.{BLOCKED}.4.1
  • {BLOCKED}.{BLOCKED}.72.7
  • {BLOCKED}.{BLOCKED}.111.114
  • {BLOCKED}.{BLOCKED}.111.122
  • {BLOCKED}.{BLOCKED}.128.106
  • {BLOCKED}.{BLOCKED}.32.106
  • {BLOCKED}.{BLOCKED}.78.2
  • {BLOCKED}.{BLOCKED}.127.114
  • {BLOCKED}.{BLOCKED}.127.122
  • {BLOCKED}.{BLOCKED}.248.219
  • {BLOCKED}.{BLOCKED}.248.245
  • {BLOCKED}.{BLOCKED}.135.1
  • {BLOCKED}.{BLOCKED}.17.2
  • {BLOCKED}.{BLOCKED}.152.130
  • {BLOCKED}.{BLOCKED}.101.3
  • {BLOCKED}.{BLOCKED}.160.194
  • {BLOCKED}.{BLOCKED}.19.40
  • {BLOCKED}.{BLOCKED}.19.50
  • {BLOCKED}.{BLOCKED}.200.139
  • {BLOCKED}.{BLOCKED}.192.100
  • {BLOCKED}.{BLOCKED}.152.99
  • {BLOCKED}.{BLOCKED}.157.99
  • {BLOCKED}.{BLOCKED}.0.124
  • {BLOCKED}.{BLOCKED}.136.10
  • {BLOCKED}.{BLOCKED}.140.10
  • {BLOCKED}.{BLOCKED}.148.37
  • {BLOCKED}.{BLOCKED}.148.39
  • {BLOCKED}.{BLOCKED}.1.66
  • {BLOCKED}.{BLOCKED}.1.66
  • {BLOCKED}.{BLOCKED}.198.230
  • {BLOCKED}.{BLOCKED}.204.66
  • {BLOCKED}.{BLOCKED}.194.55
  • {BLOCKED}.{BLOCKED}.6.99
  • {BLOCKED}.{BLOCKED}.32.132
  • {BLOCKED}.{BLOCKED}.127.1
  • {BLOCKED}.{BLOCKED}.26.42
  • {BLOCKED}.{BLOCKED}.225.253
  • {BLOCKED}.{BLOCKED}.208.3
  • {BLOCKED}.{BLOCKED}.208.6
  • {BLOCKED}.{BLOCKED}.64.68
  • {BLOCKED}.{BLOCKED}.132.2
  • {BLOCKED}.{BLOCKED}.1.227
  • {BLOCKED}.{BLOCKED}.33.227
  • {BLOCKED}.{BLOCKED}.252.200
  • {BLOCKED}.{BLOCKED}.32.100
  • {BLOCKED}.{BLOCKED}.32.103
  • {BLOCKED}.{BLOCKED}.32.106
  • {BLOCKED}.{BLOCKED}.32.109
  • {BLOCKED}.{BLOCKED}.33.52
  • {BLOCKED}.{BLOCKED}.33.60
  • {BLOCKED}.{BLOCKED}.143.69
  • {BLOCKED}.{BLOCKED}.3.70
  • {BLOCKED}.{BLOCKED}.3.73
  • {BLOCKED}.{BLOCKED}.3.76
  • {BLOCKED}.{BLOCKED}.3.79
  • {BLOCKED}.{BLOCKED}.3.83
  • {BLOCKED}.{BLOCKED}.3.85
  • {BLOCKED}.{BLOCKED}.4.12
  • {BLOCKED}.{BLOCKED}.4.15
  • {BLOCKED}.{BLOCKED}.4.18
  • {BLOCKED}.{BLOCKED}.4.21
  • {BLOCKED}.{BLOCKED}.4.6
  • {BLOCKED}.{BLOCKED}.4.9
  • {BLOCKED}.{BLOCKED}.255.1
  • {BLOCKED}.{BLOCKED}.129.30
  • {BLOCKED}.{BLOCKED}.131.11
  • {BLOCKED}.{BLOCKED}.66.66
  • {BLOCKED}.{BLOCKED}.203.86
  • {BLOCKED}.{BLOCKED}.203.90
  • {BLOCKED}.{BLOCKED}.203.98
  • {BLOCKED}.{BLOCKED}.88.88
  • {BLOCKED}.{BLOCKED}.4.66
  • {BLOCKED}.{BLOCKED}.1.20
  • {BLOCKED}.{BLOCKED}.128.68
  • {BLOCKED}.{BLOCKED}.136.68
  • {BLOCKED}.{BLOCKED}.34.10
  • {BLOCKED}.{BLOCKED}.92.86
  • {BLOCKED}.{BLOCKED}.92.98
  • {BLOCKED}.{BLOCKED}.200.68
  • {BLOCKED}.{BLOCKED}.5.240
  • {BLOCKED}.{BLOCKED}.222.222
  • {BLOCKED}.{BLOCKED}.129.81
  • {BLOCKED}.{BLOCKED}.129.80
  • {BLOCKED}.{BLOCKED}.0.110
  • {BLOCKED}.{BLOCKED}.1.40
  • {BLOCKED}.{BLOCKED}.120.5
  • {BLOCKED}.{BLOCKED}.29.93
  • {BLOCKED}.{BLOCKED}.62.142
  • {BLOCKED}.{BLOCKED}.118.162
  • {BLOCKED}.{BLOCKED}.152.129
  • {BLOCKED}.{BLOCKED}.85.85
  • {BLOCKED}.{BLOCKED}.88.88
  • {BLOCKED}.{BLOCKED}.96.66
  • {BLOCKED}.{BLOCKED}.57.33
  • {BLOCKED}.{BLOCKED}.208.46
  • {BLOCKED}.{BLOCKED}.2.2
  • {BLOCKED}.{BLOCKED}.78.210
  • {BLOCKED}.{BLOCKED}.244.5
  • {BLOCKED}.{BLOCKED}.0.130
  • {BLOCKED}.{BLOCKED}.1.130
  • {BLOCKED}.{BLOCKED}.114.133
  • {BLOCKED}.{BLOCKED}.114.166
  • {BLOCKED}.{BLOCKED}.128.68
  • {BLOCKED}.{BLOCKED}.192.68
  • {BLOCKED}.{BLOCKED}.254.34
  • {BLOCKED}.{BLOCKED}.163.68
  • {BLOCKED}.{BLOCKED}.1.4
  • {BLOCKED}.{BLOCKED}.2.69
  • {BLOCKED}.{BLOCKED}.39.73
  • {BLOCKED}.{BLOCKED}.54.66
  • {BLOCKED}.{BLOCKED}.37.1
  • {BLOCKED}.{BLOCKED}.150.101
  • {BLOCKED}.{BLOCKED}.150.123
  • {BLOCKED}.{BLOCKED}.150.139
  • {BLOCKED}.{BLOCKED}.25.129
  • {BLOCKED}.{BLOCKED}.7.1
  • {BLOCKED}.{BLOCKED}.98.3
  • {BLOCKED}.{BLOCKED}.98.6
  • {BLOCKED}.{BLOCKED}.9.61
  • {BLOCKED}.{BLOCKED}.9.9
  • {BLOCKED}.{BLOCKED}.254.5
  • {BLOCKED}.{BLOCKED}.164.13
  • {BLOCKED}.{BLOCKED}.164.18
  • {BLOCKED}.{BLOCKED}.70.98
  • {BLOCKED}.{BLOCKED}.93.33
  • {BLOCKED}.{BLOCKED}.1.1
  • {BLOCKED}.{BLOCKED}.233.1
  • {BLOCKED}.{BLOCKED}.224.3
  • {BLOCKED}.{BLOCKED}.224.5

It does the following:

  • It is capable of performing DDoS attacks

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 12.736.05
FIRST VSAPI PATTERN DATE: 24 Jul 2016
VSAPI OPR PATTERN File: 12.737.00
VSAPI OPR PATTERN Date: 25 Jul 2016

Scan your computer with your Trend Micro product to delete files detected as ELF_SETAG.TNN. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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